I am trying to use HC-05 (5V, onboard regulator levelling to 3.3v) with Arduino Pro Mini (3.3v) but I have had little success. I am using a coin cell to power the pro mini which powers it on and is working fine. But, my HC-05 doesn't power on. I am trying to power it externally using two 3.7v Lipo…

Can't power HC-05. Please help!!

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